How to Soundproof a Room

If you're seeking a quiet space isolated from the outside world—whether for a recording studio or a music listening room—you'll likely want to soundproof the area. Continue reading for a few professional but affordable soundproofing techniques to enhance your space.

Install soundproof curtains or heavy drapes. You can partially block out sound by hanging thick curtains on the walls. If you're willing to spend a little more, opt for higher-quality soundproof curtains.

• If your home already has thick, soundproof walls, the curtains will serve as an additional barrier.

Use Bookshelves. You can make your walls thicker and improve soundproofing by using bookshelves. Cover the wall entirely with bookshelves and books to create a sound barrier that blocks noise effectively. Additionally, your room will become a beautiful library.

Hang Vibrating Objects. Have you ever noticed the rattling sound when your neighbors play loud music? That’s exactly why you should hang objects like speakers. Use vibration-damping panels when hanging these items to avoid disturbing others around you.

Install Door Seals. Attach a rubber seal to the base of the door to fill in any gaps. If the gap is too wide for just the seal, add a wooden piece under the door before installing the seal.

Use Acoustic Stickers. Buy adhesive acoustic pads measuring 30x30cm with a thickness of 5cm. These pads effectively absorb sound across a wide range of frequencies. Some pads come with adhesive backing, while others require 3M spray adhesive for installation on walls and ceilings. You can cover the entire surface or just part of it, depending on how much soundproofing you need. This method will reduce noise coming from the room and improve sound quality, especially when used in a room designed for vocal practice.

• Opt for acoustic pads made of fiberglass with a thin perforated Mylar surface. This material offers the highest sound absorption rate compared to most others, but it is also the most expensive. This product is worth investing in over any other available options.

Use Thick Materials. The thicker and denser the material, the better it absorbs sound. Consider using 1.6cm thick drywall instead of thinner alternatives.

• If you want to renovate existing walls, build a basic wall structure and attach it to the surface, connecting it to the existing fasteners. Cover the exterior with drywall or new plasterboard.

Separate the Two Layers of Wall. When sound enters a material, part of the energy is absorbed and some bounces back. Enhance this effect by constructing a wall from two layers of drywall or plasterboard, with the greater the gap between them, the better. This is known as the floating wall method.

• However, the floating wall method is not very effective at blocking low-frequency sounds, as the sound tends to bounce back. If the gap is 2.5cm or less, you should use sound-absorbing materials to counteract this effect.

Determine the Placement of Fasteners. Most walls have a row of fasteners that connect the two layers. Sound easily passes through these fasteners, compromising your soundproofing efforts. When building a new wall, you should choose one of the following fastener placement methods:

• Place two rows of fasteners, one on each side. This is the most effective soundproofing method but requires sufficient space to leave a gap between the two rows.
• Place fasteners in a staggered pattern, meaning alternate fasteners on each side of the wall.

Fill the gap between wall partitions with soundproof compound. This material can convert sound energy into heat. It’s ideal for use between layers of walls, floors, or ceilings. Unlike other methods, this approach absorbs low-frequency sounds. This makes the soundproofing compound perfect for blocking bass-heavy music and for home theater rooms.

• This product is also known on the market as soundproofing adhesive or elastic noise-reducing glue.
• Some types may require several days or even weeks to reach their full effectiveness.

Soundproofing with other materials. While soundproofing compounds are versatile and suitable for most needs, there are other materials that can also be used.

• Fiberglass is inexpensive and fairly effective for soundproofing.
• Soundproofing foam, however, is not as efficient. It is primarily used for thermal insulation.

Seal gaps with soundproof sealant. Even small cracks or gaps can undermine your soundproofing efforts. Soundproof sealants can fill these voids with an elastic material that blocks sound. Make sure to seal any cracks and joints around walls and windows. Remember these tips:

• Water-based sealants are easier to remove. If you’re using solvent-based sealants, check the product label to ensure they won’t damage your materials.
• If the sealant doesn’t match your wall color, choose one that you can paint over.
• Consider using regular sealants for small gaps as soundproofing sealants can be trickier to apply.

Soundproofing floors and ceilings. Floors and ceilings can be soundproofed using many of the same methods as walls. The most common approach is to add one or two layers of drywall and insert soundproofing adhesive between these layers. A simple extra step would be to lay an acoustic mat on the floor, followed by carpet.

• You don’t need to soundproof the floor if there’s no room below.
• Adding drywall and soundproofing compounds to a concrete ceiling may not yield significant benefits. Instead, consider installing drywall with a gap from the concrete ceiling, or filling the gap with fiberglass.

Installing soundproof panels. If the room is already finished but lacks adequate soundproofing, you can install soundproof panels. The market offers budget options, but higher-end panels tend to provide better results.

• Make sure to mount these panels securely with screws or other sturdy fastenings.

• Replace ceiling tiles made from hard cellulose materials, as they can reflect sound.
• Seal gaps around light fixture holes and the perimeter of dropped ceilings.

• Major construction or extensive repairs on walls, floors, and ceilings should always be conducted under the guidance of an experienced professional.
• The Sound Transmission Class (STC) rating system isn't always reliable. It doesn't account for frequencies below 125 Hz, which include sounds from music, traffic, airplanes, and construction work.